Wrench.



L; BEKKER.

WRENCH.

APPLICATION FILED DBO. 27, 1909. RENEWED JAN. 14. 1911.

Patented Feb. 28, 1 911.

awwmtoq, ludwi Bekker.

UNITED STATES PATENT OFFICE.

LUDWIG BEKKER, OF ABERDEEN, SOUTH DAKOTA.

WRENCH.

Application filed December 27, 1909, Serial No. 535,072. Renewed January 14, 1911.

which require the use of a large amount of material, and occupy considerable space,

and adapt the device to equally efficient. op-

eration by other modifications of structure.

An important improvement accomplished is the provision of such a device adapted to operate upon nuts of a maximum size, while the wrench itself occupies a minimum amount of space.

Other objects and advantages will. be ap parent from the following description, and it will be understood that changes in the specific structure shown and described may be made within the scope of the claims without departing from the spirit of the invention.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a side view of the device, Fig. 2 is a longitudinal. sectional view, Fig. 3 is a rear view, Fig. 4 is a plan view of the sliding jaw. Fig. 5 is a side view of a modification.

Referring to the drawings, there is shown a stationary member A comprising a threaded shank portion and the laterally proj ecting jaw 11, upon which there is slidably engaged the movable jaw 12 adapted to be engaged by the rotating handle 13 threaded upon the lower end of the shank. It will be noted that the opposed faces of the jaws are provided with recesses reduced at successive stages of their depth, each of the portions of like dept-h being of a common width, and forming shoulders 1 1, as shown, adjacent the inner and outer ends of the jaws. The handle portion 13 is provided with an enlarged bearing portion 15 at its inner end serving to engage firmly against the outer side of the movable jaw 12.

It will be noted that the stationary memher A- is provided with a longitudinally ex- Specification of Letters Patent.

Patented Feb. 28, 1911.

Serial No. 602,689.

tending channel 16 formed in the shank 10 on the side opposite the jaw 11, the channel extending upwardly and through the rearwardly projecting head portion 17 of the stationary member. The movable jaw 12 is provided with a suitable vertical passage 18 t-herethrough, through which the shank 10 is slidably engaged. A rib 19 is formed within the openin extending longitudinally thereof and being disposed at the rear side for engagement in the channel 17 to hold the jaws 11 and 12 securely in registering relation. The movable jaw 12 extends backwardly beyondthc opening 18 and is provided with an upward extension 20, upon which the rib 19 is continued to a spaced distance above the plane of the inner face of the jaw. This upwardly extended portion 20 serves a peculiar function as will now be made apparent.

In use, the handle is unscrewed from the shank a suflicient distance to allow separation of the jaws to the extent necessary for the engagement of the nut t-herebetween, after which the handle is again rotated and screwed snugly against the under jaw forcing it into firm engagement with the object to be operated on.

It will be understood that ordinarily without the provision of the extension 20, the inner end of the jaw would tend to be forced toward the upper end of the shank after its forward portion had become engaged with the work, tending to bind the jaw upon the shank and producing strain which might result in the bending or fracturing of the lower jaw and at any rate disposing the two jaws at an angle with respect to each other which would materially detract from their GlfiCiQDCY. The rib portion upon the extension 20 serves to overcome this tendency, acting as a guide and bearing against the rear side of the shank when the lower jaw tends to converge rearwardly toward the upper jaw. The rear side of the opening 18 through the aw is set outwardly sufficiently to prevent its engagement with the threaded portion of the shank, so that the rib portion 19 engages freely against the base of the channel 16, thus avoiding danger of burring the thread.

In Fig. 5 there is shown a modification of the device in which the lower jaw is provided with a projection upon its lower side forming a shoulder 26 spaced a short distance from the shank, and the handle member is providedzwith an 'ajiinular fiip-r 'wardly extending seatflange QYQ "Bv -the' usezbf this form Ofjth device, the tendency?v offthe lowerfsideo; iithefimovableg jaw to be Y forced inwardly against the threads is 'over- OQme by-reason of thefengagement of the shoulder 26'gagainst the flange 27'; and the extension2O*icoaots[therewith to hold the v stationaryjaw f I ZWhLatis cla med' szl I V flowerj aw firmly, in parallelrelation with the ing' a statioiiaryin;emberincludiiiga threadjgedshank anda j awlhead, said shank having a 'loi'ig-itudinally extending 'chan nelffoi'ined upon the side oppositeth'e jaw and-extend ing upwardly through the jawheach-faanovi a rib formed in the passage andengageai the channel to retain thejmovablex aw In H V registry with thefirst'nanied jaw,'said i'novf; able aw carry ng-an extension upon its, rear;

7 inner side 1forming. coi' tini'iation o ffthe ;1 .1.b member and adapted to pro eotthrough QQIn adevitce of-the class described, the

combination with a. stationa-ry'member' in; cluding a'threadedsh'ank and jaw head, said sshank having a longitudinally 1 extending channel formed its rear side and extending through the jaw head, a movable" jaw the shank slidably, said movable jaw having an extension upon its rear inner side extendingv longitu'dinally of the shank and carry- ,ing a rib portion extending into said pasable jaw having apassage; theretl' rough en: .gaged slidably uponthe shank and havlng the clianneljin the jaw head at: time's,,and;

' having Ta passage "theret-hrough' receiving a s ge; through the'imovable jaw and bearing a'gainst'the ba'se'ofsaidchannel for theflpurpose described, said exten ion being ada )ted tofprojeotthrough-the'channel in the ead poi tionat times to allow the jaws to lie in close sconta'chj-and; an interiorly threaded 'handlegportion engaged upon the shank andada'ptedftoberotated'to bear against the outer side of. the movable jaw,.as described. 3.;In adeviceoi thef'class describ ed,the

y K f" y g combination witlra stationary member-in- V 1. A deviceoit' the class described compriss tendinglongitudinally of the shank and Y carrying a rib "portion extending into said passage through the" movable jaw and bearingfagainst thebase of-said channel for the purpose described, said extension being adapted to project through the channel in the head portion at times to allow the jaws to he in close ,c ntaCt, said movable jaw having'a projectionformed on itsouter 'side to provide 'a shoulder spaced from the shank, and an interiorlythreaded handle member engaged upon theshank and adapted for rotation to' bear against the outer side of said movable jaw, said handle having'a longitu dinally projecting support; flange arranged to engageinwardly of said shoulder for support of-ihe jaw as described.

' In testimony whereof I atfix my signature,

in presence oftwowitnesses.

LUDWIG K ER.

is lVitnesses -BYIioN 'A. WALTON,

F. E. Moons. 1

5 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of. Patents,

T i Washington; D. G. V 

